A student replaces the slip rings of a simple alternator with a correctly aligned split-ring commutator. The coil and its direction of rotation are unchanged.
Which statement describes the resulting output?
The current stays constant in size and keeps the same direction.
The current varies in size and reverses direction each half-turn.
The current stays constant in size and reverses each half-turn.
The current varies in size but keeps the same direction.
92 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.